The flowers that are most commonly referred to as the rarest ones are Corpse Flower, Jade Vine, and Ghost Orchid. However, if we look at the flowers that have concrete information about their population size, the answer is clear. The rarest flower in the world is the Middlemist Red.
The scientific name of this flower is the Unspecified Camellia, and currently, there are only two known examples of this flower in the entire world. One is located at a greenhouse in New Zealand, while the other one can be found in the United Kingdom, in Chiswick House.
This flower originally came to England from China in 1804. The person that brought it westward was John Middlemist. He gave the extremely rare flower as a gift to the Kew Gardens. However, the flower vanished several decades later. It wasn’t until recently that another one bloomed at a greenhouse in the United Kingdom.